Grinding and polishing material



UNrTE IVILLIAM L. KANN, OF ALLEGHENY, PENNSYLVANIA.

GRINDING AND POLISHING MATERIAL.

SPECIFICATION forming part of Letters Patent No. 511,779, dated January 2, 1894.

' Application filed May I, 1893. Serial No. 472,602. (No specimens.)

T0 aZZ whom it may concern:

Be it known that 1, WILLIAM L. KANN, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Grinding and P01- ishing Material, of which the following is a full, clear, and exact description.

My invention relates to material for grinding, rubbing or polishing glass, and it consists in a material comprising in combination fine particles or powder of fractured steel, and other softer or more friable material which prevents the steel exercising a too greatly abrasive action upon the surface to be treated. The fractured steel is obtained by heating steel, preferably steel scrap, to a temperature sufficient to burn it, which temperature may be stated approximately to be 2,500 Fahrenheit; then reducing the steel to crystalline structure by plunging it while hot into a bath of water or other liquid, and then separating its crystalline particles by hammering. The particles so obtained may, if desired, be tempered by heating to a blue or straw color and then cooling slowly. The particles which I employ for the purpose mentioned are preferably very fine, such as will pass through atwo hundred mesh sieve. For polishing glass, I mix these fine steel particles with rouge, or any other fine material suitable for the purpose of polishing glass, all of which I include in the term rouge, preferably one part rouge and two parts steel, though the proportions of this and other mixtures which I shall describe may be varied within wide limits. In fact, any proportions which may be found suitable may be employed. The presence of the rouge enables the composition to be made into pasty form when used and prevents injurious abrasion of the glass, while the use of the steel'particles very greatly accelerates the polishing operation.

For grinding glass, I mix the steel particles with ordinary grinding sand, preferably in about the proportion in which the rouge is used; and for rubbing sheet glass, I mix it with finer sand, preferably in about the same proportions. In these compositions, the sand peforms a function analogous to that of the rouge, in that it protects the glass, While the Work of grinding is very much quickened by the use of the steel. These compositions may be applied to use in the same manner as the grinding, polishing and rubbing materials now ordinarily employed, and their advantages will be appreciated by those skilled in the art.

I claim- 1. A grinding,polishing or rubbing composition comprising fractured steel mixed with a softer or more friable material; substantially as described.

2. A polishing composition comprising fractured steel mixed with rouge; substantially as described.

In testimony whereof I have hereunto set my hand.

\VILLIAM L. KANN.

\Vitnesses:

W. B. OORWIN, H. M. CORWIN. 

